“Comes Willielmus Sarum” donated property to Bradenstoke priory, for the souls of “Elæ comitissæ matris meæ…patris mei comitis Patricii…fratris mei Patricii”, by undated charter, witnessed by “Philippus et Walterus fratres mei…”.
He succeeded his father in 1168 as Earl of Wiltshire, but was always styled Earl of Salisbury. The Red Book of the Exchequer refers to "Willelmus filius comitis Patricii lvi l xvi s, de novo xl s" in Wiltshire in [1171/72]. “Willielmus comes Sarum” donated property to Bradenstoke priory, for the souls of “Alianoræ de Viterio comitissæ meæ…Patricii patris mei et Elæ matris meæ et Patricii fratris mei”, by undated charter, witnessed by “…Waltero filio meo…”.
The Continuator of Florence of Worcester records the death of "Willelmus comes Saresberiensis filius comitis Patricii" in . The Annals of Margan record the death in 1197 of “Willelmus comes Saresbiriæ”. The Annals of Worcester record the death in 1197 of “Willelmus comes Sarum”. The Book of Lacock records that “Ela…pater” died in 1196 and was buried “apud Bradenestok”. 1